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Updated: Sep 11, 2025

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7ÃƒÆ’Ã‚Â¢Ãƒâ€¹Ã¢â‚¬Â 'ÃƒÆ’Ã…Â½ Â´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7ÃƒÆ’Ã‚Â¢Ãƒâ€¹Ã¢â‚¬Â 'ÃƒÆ’Ã…Â½ Â´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

Published on: April 12, 2019

在Sr-doped La₃Ni₂O₇薄膜中的超导性

Bo Hao^1,2, Maosen Wang^1,2, Wenjie Sun^1,2

¹National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing, China.

Nature materials

|August 18, 2025

概括

超导性在添加La3Ni2O7薄膜中被发现,达到42K的临界温度. 这项研究探讨了对这些新型超导材料相图的兴奋剂效应.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
固态化学固态化学

背景情况:

最近的发现凸显了压力压缩拉3尼2O7薄膜中的环境压力超导性.
这些材料中异质注的相位图对于推进超导性研究至关重要,但仍未得到充分探索.

研究的目的:

为了研究 (Sr2+) 合的La3-xSrxNi2O7薄膜中的超导性.
探索异质剂对La3Ni2O7.7的超导特性和相位图的影响.

主要方法:

用Sr2+添加La3Ni2O7.7的薄膜合成.
电传输测量以确定超导过渡温度 (Tc),临界电流 (Jc) 和上临界场 (μ0Hc).
扫描传输电子显微镜 (STEM) 用于分析结构性质和氧空隙分布.

主要成果:

在La3-xSrxNi2O7薄膜中观察到超导性,Tc跟随不完整的圆顶形形状.
经过最佳合的片显示Tc为~42K,高Jc (>1.4kA cm-2在2K) 和显著的上临界场 (μ0Hc,(0) = 83.7T,μ0Hc,(0) = 110.3T).
STEM揭示了平面氧气空缺和延长的非平面Ni-O键,归因于压缩应变,可能削弱层间合.

结论:

使用Sr2+的异质注引入了La3Ni2O7薄膜中的超导性,扩大了已知的超导相空间.
在应变下观察到的结构变化,包括平面氧空隙和改变的Ni-O键长度,影响了超导特性.
进一步研究应变工程和兴奋剂策略是有必要的,以优化高Tc材料.

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